From: Eric W. Biederman <ebiederm@xmission.com>
Date: Mon, 11 May 2015 21:44:25 +0000 (-0500)
Subject: proc: Allow creating permanently empty directories that serve as mount points
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~19^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eb6d38d5427b3ad42f5268da0f1dd31bb0af1264;p=pandora-kernel.git

proc: Allow creating permanently empty directories that serve as mount points

Add a new function proc_create_mount_point that when used to creates a
directory that can not be added to.

Add a new function is_empty_pde to test if a function is a mount
point.

Update the code to use make_empty_dir_inode when reporting
a permanently empty directory to the vfs.

Update the code to not allow adding to permanently empty directories.

Update /proc/openprom and /proc/fs/nfsd to be permanently empty directories.

Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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